[sdiy] Can you call the low pass filter in a frequency shifter an antialiasing filter?

[ASSI]

On Tuesday 05 October 2010, cheater cheater wrote:
> So is there an easy explanation of what a quadrature mixer is? I'm
> happy for heavy maths, but heavy electronics scare me a bit ...

Then it will certainly excite you to hear that "quadrature mixer" is the 
maths-light term for the more math-heavy description "mixer that works with 
analytic signals" (and for the more practically minded description "single-
sideband mixer").  "Mixing" refers to modulation, which is a multiplication 
in the time-domain or equally a folding operation in the frequency domain.  
"Analytic signal" is a description of a signal by a superposition of complex 
exponentials instead of real-valued functions.


Achim.
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